How I Built a 15,000+ Line Flutter App with Gemini to "Hack" My University Attendance

This is a submission for the Built with Google Gemini: Writing Challenge What I Built with Google Gemini As an IT undergraduate balancing startup ambitions and a heavy coursework load, missing too many classes can lead to disastrous exam bans. To solve this, I built Attendance Tracker (code-named "The 80%"). It's a cross-platform Flutter application designed to mathematically optimize university attendance using offline-first storage and AI. The app features a "Danger Zone Planner" that calculates the exact margin for absences across specific sessions (Lectures, Labs, Tutorials). This allows students to simulate granular scenarios and understand their attendance buffer, ensuring they never accidentally drop below their mandatory academic thresholds. Google Gemini played a massive, two-fold role in this project: The Architecture (Agentic AI): This project scaled to over 15,000 lines of code. I used the Gemini 3 Pro (High) model inside the Antigravity IDE as an autonomous coding agent to